Hot water heating system with auxiliary domestic water heater



July 16, 1935, E. R. SNAVELY HOT WATER HEATING SYSTEM WITH AUXILIARY DOMESTIC WATER HEATER Filed Feb. 21, 1934 2 Sheets-Sheet 1 v1 0 f. n e D n 3 2 Sheets-Sheet 2 July 16, 1935- E. R. SNAVELY HOT WATER HEATING SYSTEM WITH AUXILIARY DOMESTIC WATER HEATE Filed Feb. 21, 1954 ing, cooking and the like.

' I Patented July 16, 1935- v 2,008,568

UNITED. STATES PATENT OFFICE HOT WATER HEATING' SYSTEM WITH AUXILIARY normsTrc WATER HEATER Earl R. Snavely, Union, N. J., assignor to Evelyn L. Snavely, Newark, N. J.

Application February 21, 1934, Serial No. 112,405

4 Claims. (01. 237-19) This invention relates to heating systems'and Among the objects, therefore, of the present particularly to thetype of heating system'whereinvention are to provide a novel combination of in water is heated for heating rooms of the builda main hot water heating system and a suppleing and other water is heated for use in bathmental system for heating water for household In systems of this character it is usual to emcommon a heat exchanger; to provide novel ploy a heating furnace containing water spaces means for ensuring circulation of the water of or passages and a fuel combustion chamber. the main system through the heat exchanger Radiators are connected to the water-spaces of while the flow through theradiators of the main the furnace by supply and return pipes and the system is stopped; to provide a novel thermowater system thus forms a closed circuit, not static control for such combined systems and to water flowing from the furnace through the supprovidenovel thermostatically controlled valves ply .pipes to and through the radiators where it for controlling the flow of water through the main loses much of its heat and returns to the fursystem. v nace through the return pipes. It is not desir- In the accompanying drawings is illustrated 15 able to draw ofi for house use any of the water one embodiment of my invent and from such a system. It is common, therefore, to Fig, 1 is a n ral S emati Vi w in el v i have a separate system for the hot water to be of the pa s 0t combined s m constructed used for household purposes. v in accordance with this invention. It has been customary to heat the household Fig. 2 is an enlarged vertical section hr h 2 water in a heat exchanger having'a coil of copthe t m stat easing used herewith, the View per pipe surrounded by a casing, the casing being Showing a y p e thermestat q. ill the connected in one of the supply pipes from the casing and also disclosing ce a of the Parts furnace and the coil being connected in the connected wi h h Y Dh H- or other special use, the two systems including in 5 household piping. It is desirable to, maintain a 3 is an enlarged deteii Section on the line 25 constant supply of hot water for household or 0f domestic purposes at all times. Also, in certain sa section. pa y in l v n, on the factory operations it is essential that there should line 01' Fig. 3.

be a constant supply of hot water for heating 5 15 8 Section 011 the e of certain parts of the factory or certain apparatus Fig. 6 is a section on the line 6-8 of Fi 30 and that 'this supply be independent of ,the radi- In these tire-Wings there is u a ed, in ators used for general heating of the factory. line, afurnace Ill which may be of any ordinary In both residence and factory buildings it is desir- Construction Of that p of e used for hot able to maintain a suitable temperature inde- Water heatin Th details f h f rna e r .35 pendent of the weather conditions and, for that 01d and Well known and it is not deemed necespurpose, it is customary to decrease the temperai here to illustrate the One more ture of the radiators in wariner weather and to upp y P p risers H lead m t e upp p increase such temperature during colder weather. the vWetter space to the usual hot water radia- This may be efiected either by utilizing valve tors (not shown) of the main heating system and 40 means to control the supply of hot water to the 8- return p p confhlets the tooled Water from 40 radiators or by controlling the furnace temperasuch radiators back to the lower part of the furture by regulating the consumption of fuel eithe'r mine water space. by manual or by thermostatic control. In any A ,heat excha u t aving a casin i3 case, it'is desirable to maintain a predetermined closing a coil I4 s Co cted by a p p 15 With minimum temperature of. the water in the furnace the lower part Of the wate Spa of the fllmace- 45 water space when no heat is required in the ra- A, valve i6 is located in the pipe l5 and a drain 'diators so that heat may be quickly supplied to cook I1 is also connected to the pipe I5 to permit such radiators without the necessity of heating draining oi the main heating system. Apipe l8 cold water. leads fromthe upper end of the casing l3 to a 0 It has been proposed to utilize thermostatically thermostatic control device indicated in general 5 controlled valves in the supply pipes for the raat T. diators but the usual types of hot water valves The thermostatic devices for actuating valves do not lend themselves. to thermostatic control have heretofore been enclosed within the risers because of the very considerable power required and hence were not readily accessible for exami- 5 for their operation. nation. or repair. I have devised a thermostatic valve actuator and control device which is positioned in a well or double-walled casing or shell inserted in one of the water lines, preferably one leading from the top of the boiler water space to the heat exchange unit or indirect heater.

The outer shell I 9 of the thermostatic valve control device is provided with nipples wand ZI connected respectively to the pipe I8, leading to the heat exchange unit and to the pipe 22, leading from one of the risers at the top of the boiler. The inner shell 24 is of smaller diameter, closed at the bottom and. open at the top and provided with a flange 26 which is bolted at 29 to a flange 23 on the outer shell with an interposed packing ring or gasket 21. This construction provides an open well surrounded by the hot water from the boiler which circulates between the outer and inner shells.

The thermostatic device 32 which actuates the valves is preferably a sylphon bellows which contains the usual highly volatile liquid. A threaded stud 3| projecting from the bottom, extends through an opening 3|] in the bottom of the inner shell or cup 24 and is secured by a nut 33. A stem 4I projects upwardly from the sylphon bellows and is guided through a tubular bolt 35 secured by nut 36 in a central opening in the cover plate 28. The valve-operating lever 48 is pivotally secured at its inner end to the top of the stem H and is fulcrumed on a post 35 which is carried by a radial arm 34 having an eye surrounding the bolt 35 and rigidly held by a set screw 38 passing through a down turned lug on the outer end of the arm.

In each of the pipes or risers II is interposed a valve indicated in general at V. Each of these valves comprises a casing 42 having a bottom through which extends a tubular member forming an outer nipple 43 and an inner nipple 44, the pipe II having its lower section threaded to the lower nipple. A cover 45 closes the upper end of the casing 42 and is provided with an upwardly projecting nipple 46 whereto is connected the upper section of the riser piper I I. A packing ring or gasket 41 is interposed between the cover 45 and casing 42. An inverted cup 48 is located within the casing and is of considerably greater diameter than the nipple 44. This cup is movable between the full line position and the dotted line position of Fig. 4, the upper position being its open position and the lower position being the closed position. The cup normally contains air so that, when depressed the flow of hot water upwardly through the valve is interrupted by the air-gap formed in the line. Guide prongs 48 extend downwardly from the top or closed end of the cup and engage the inner surface of the nipple 44. Similarly, guide lugs 58 extend radially from the upper end of the cup and engage the inner surface of the body 42. By means of these prongs and lugs the cup is constrained to move in a vertical rectilinear path without tilting or cocking and thus without sticking or Jamming. A yoke. 5| extends diametrically across the top of the cup 48. Packing glands or boxes 52 are alined opposite each other on the upper part of the cup and through these glands extends a shaft 53 having a tJ-shaped crank 54 which straddles the yoke 5I and engages at its free end beneath said yoke so that oscillation of the shaft 53 eflects the raising and lowering of the cup 48. An actuating crank 55 is provided on that portion of.

the shaft which is exterior of the valve and a connecting rod56 connects the crank 55 with the end of the lever remote from the stem 4|. Where two or more pipes I I are used, then valves may be disposed side by side as shown in Fig. l and the shaft 53 may extend continuously through the several valve bodies so that but one thermostat and one crank 55 is necessary to effect opening and closing of the several valves in unison.

At 60 is indicated a hot water storage tank which is to be understood as showing any apparatus or means which it is desired to supply constantly with hot water. A pipe 51 connects the upper end of the coil I4 to this tank and a second pipe 58 connects the lower end of the coil I4 to the tank. A valve 59 is preferably interposed in the pipe 58 and a drain cock is-also connected to this pipe so that the supplementary system may be drained if desired.

While the fuel consumption may be regulated by hand it is preferred to utilize automatic means for "this purpose. Thus motor driven blower or oil burner BI may be connected by conductors 62 to a'furnace control thermostatic device 63 and a room thermostat 64, in a compartment heated by the main heating system. The furnace control switch may be of any desired type capable of closing the circuit for operating the device BI upon the boiler temperature dropping to a predetermined minimum temperature and opening the circuit upon the water in the furnace reaching a predetermined higher temperature and the room thermostat is likewise of any well known type capable of adjustment to close the circuit at a predetermined low room temperature and to open the circuit at a predetermined high room temperature. The sylphon bellows is so proportioned and connected to the shaft that it is expanded to operate the valves 48 to upper open position when the water circulating through the channel 25 between the inner and outer walls of the thermostat casing or housing T, is raised to a temperature suflicient to heat the radiators to room temperature. This occurs when a room thermostat 64 closes the circuit which controls the furnace dampers or the fuel supply blower. As soon as the furnace responds, heating the water to the desired temperature, the sylphon bellows '32 expands and operates the valves 48 to open position, thereby permitting the water to circulate through the house heating system.

When the room thermostat opens its contacts, the furnace draft or fuel control device GI shuts off, causing the water in the furnace to cool down to a minimum predetermined temperature re-- quired by the heat exchange unit I3 to heat the water in the storage tank 60 at the temperature required for domestic purposes. This minimum boiler temperature may be controlled by a suitable hydrostat 63 attached to the boiler. As soon as the water in the risers has dropped below that required for the house heating system, the sylphon bellows contracts and lowers the riser valves 48 to closed position. It is obvious that other types of valves may be used.

While the sylphon bellows is well adapted for actuating the riser valves, it is obvious that other types of thermostatic devices may be employed. By locating the thermostatic device in a well or housing which is exterior to the water channels, it may be readily inspected or removed.

1 claim: I 1. The combination with separate main and secondary hot water heating systems, of a boiler and a supply pipe connecting said boiler to said main system, a connection between said supply pipe and said boiler, a heat exchangeunit interposed in said connection, for supplying heat to laidsecondarysymathermostatreceivinz heatiromtheiluidinsaidconnectiomvaive meansbetweensaidconnectionandsaidmain saidboilenaheatexcbanacunitinterposedin said connection to: supplying heat to said secondary system. a hollow double-walled casing in systemoperatinztoopenorclosetheilowsaidconnectionprovidlnzachamberorwell said connection for supplying heat to said see-- ondary system. a hollow double-walled casing in said connection providing a chamber or well, inlet and outlet connecting the channel formed between the walls of said casingvwlth said last named connection, valve means between said connection and said main system operating to open orclosetheiiowotwaterthrouehthemain system',athermostatlocatedinsaidwell.and operative means connecting said thermostat and saidvalvemeanstoopenorclosesaidvalvemeans' in response to high orlow temperature 7 changes mespectivelyinthewaterflowingthrcughsaid 3.Thecombinaflon withseparatemainand secondaryhotwaterheatingnstemaotaboiler anda'supplypipeiromsaidboiler saidsystem,abetweensaidsimplypipeand inlet and outlet passages connecting the channeli'ormedbetweenthewallsoisaidoasinswith said connectiom valve means between said connectionandsaidmainsystemoperatingtoopen' orclosetheiiowoiwaterthroughthemainsystem, a sylphon bellows located in said well and having one end removablv attached to the bot-' tom wall thereof. ands linkaae connecting the other end ofsaid bellows with said valve means to therebyopenandclosesaid valvemeans in accordance with the expansion and contraction oi. the bellows.

4. In an automatic control system for a house heating system, a boiler and a supply pipe connectediromtheupperpartoisaidboilertosaid system, means for controlling the boiler temperature, a connection between said supply pipe and the lower pal-tot said boilena valve insaid supply p pe beyond said connection, a recess or hollow chamber within said last named connection, a sylphon bellows secured within said chamber responsive to White changes of the fluid in said connection. and means operatively connectihc said bellows with said valve to open and close the valve in accordance with said temperature changes. IARL R. SNAVELY. 

